docstr: Indicate to the batcher that no more blocks will be added to the buffer.
docstr_tok: ["Indicate","to","the","batcher","that","no","more","blocks","will","be","added","to","the","buffer","."]
code: def done_adding(self) -> bool:
      """Indicate to the batcher that no more blocks will be added to the buffer."""
      raise NotImplementedError()
  
imports: from typing import Optional
  from ray.data._internal.arrow_block import ArrowBlockAccessor
  from ray.data._internal.arrow_ops import transform_pyarrow
  from ray.data._internal.delegating_block_builder import DelegatingBlockBuilder
  from ray.data.block import Block, BlockAccessor
label_desc: Use image node_id 2 for calling the BatcherInterface obj's underlying member method code with example usage: obj.done_adding() without return types